Big Four accountancy firm PwC's legal arm has won a  major contract to provide legal services to the U.K.'s Department for Transport's (DfT) Transport and Works Act Unit.

The £833,333 ($1 million) contract is PwC's most recent public legal services award this year and follows the firm's £5 million ($6.5 million) contract to advise the Insolvency Service in March.

The two contracts are among the largest government legal mandate wins for any Big Four firm, and represent the auditing giant's ambition to broaden its legal services into the public sector.

The win follows PwC's push to expand its financial services legal offering, with the legal arm already having experienced year-on-year growth since it began practising law in 2014. PwC is the only firm among the Big Four to practise law in more than 100 countries, with 3,500 legal professionals worldwide, compared with Deloitte, which has 2,500 legal professionals worldwide, KPMG , which has 2,300, and EY, which has 2,200.

Under the contract with the DfT's Transport and Works Act Unit, PwC will advise on development consent orders and Transport and Works Act applications for a term of one year. The award document states that PwC will "provide advice and support on applications brought by Highways England".

The contract will run from October 6, 2019 to October 5, 2020. As part of the award, PwC will meet with the Transport and Works Act Unit and DfT once a month.

Meanwhile, Burges Salmon has also secured a £2.5 million ($3.2 million) government contract to provide legal services to DfT.

In 2018, PwC Legal's revenues climbed to about £70 million ($90.3 million).